SAUDI-ISLAM-HAJJ-SECURITY

Saudi Interior Ministry special forces parade on October 20, 2012 in Mecca ahead of the hajj pilgrimage -- the world's largest annual gathering that keeps Saudi authorities on high alert.

Saudi Interior Ministry special forces parade on October 20, 2012 in Mecca ahead of the hajj pilgrimage -- the world's largest annual gathering that keeps Saudi authorities on high alert. (FAYEZ NURELDINE, AFP/Getty Images)

Saudi Interior Ministry special forces parade on October 20, 2012 in Mecca ahead of the hajj pilgrimage -- the world's largest annual gathering that keeps Saudi authorities on high alert.